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.TH THR_KILL 3C "Mar 23, 2005"
.SH NAME
thr_kill \- send a signal to a thread
.SH SYNOPSIS
.LP
.nf
cc -mt [ \fIflag\fR... ] \fIfile\fR... [ \fIlibrary\fR... ]
#include <signal.h>
#include <thread.h>

\fBint\fR \fBthr_kill\fR(\fBthread_t\fR \fIthread\fR, \fBint\fR \fIsig\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBthr_kill()\fR function sends the \fIsig\fR signal to the thread
designated by \fIthread\fR. The \fIthread\fR argument must be a member of the
same process as the calling thread. The \fIsig\fR argument must be one of the
signals listed in \fBsignal.h\fR(3HEAD), with the exception of \fBSIGCANCEL\fR
being reserved and off limits to \fBthr_kill()\fR. If \fIsig\fR is \fB0\fR, a
validity check is done for the existence of the target thread; no signal is
sent.
.SH RETURN VALUES
.sp
.LP
Upon successful completion, \fBthr_kill()\fR returns \fB0\fR. Otherwise,  an
error number is returned. In the event of failure, no signal is sent.
.SH ERRORS
.sp
.LP
The \fBthr_kill()\fR function will fail if:
.sp
.ne 2
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 10n
The \fIsig\fR argument value is not zero and is an invalid or an  unsupported
signal number.
.RE

.sp
.ne 2
.na
\fB\fBESRCH\fR\fR
.ad
.RS 10n
No thread was found that corresponded to the thread designated by \fIthread\fR
ID.
.RE

.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
MT-Level	Async-Signal-Safe
.TE

.SH SEE ALSO
.sp
.LP
.BR kill (2),
.BR sigaction (2),
.BR raise (3C),
.BR thr_self (3C),
.BR signal.h (3HEAD),
.BR attributes (7),
.BR standards (7)
